Good question and you should seek and intellectual property attorney to sort it out, preferably one with engineering background and patent experience. Definitely one that can deal with mesh issues. Copyright is changing these days and what is TOS or appropriate ettiquate are different. You may find that what you can do under copyright law is not going to pass on a particular website, etc. Most site operators draw a more conservative line. So maybe the question to ask is not just what the copyright law is, but what the marketing requirements might be. It would defeat the purpose to be in compliance with copyright and not find a place to market.